Java program basic to advance

Print Hello world:

class helloworld{ public static void main(String args[]){ System.out.println("Hello world"); } }

Take input in java:

import java.util.Scanner; // import the Scanner class class Main { public static void main(String[] args) { Scanner myObj = new Scanner(System.in); String userName; // Enter username and press Enter System.out.println("Enter username"); userName = myObj.nextLine(); System.out.println("Username is: " + userName); } }

Addition of number:

public class Main { public static void main(String[] args) { int x = 5; int y = 6; int sum = x + y; System.out.println(sum); // Print the sum of x + y } }

Series of Addition of square of numbers:

public class Main { public static void main(String[] args) { String words = "One Two Three Four"; int countWords = words.split("\\s").length; System.out.println(countWords); } }

Check whether the no is odd or even:

import java.util.Scanner; public class JavaExample { public static void main(String args[]) { int num; System.out.print("Enter an Integer number: "); //The input provided by user is stored in num Scanner input = new Scanner(System.in); num = input.nextInt(); // If number is divisible by 2 then it's an even number //else it is an odd number if ( num % 2 == 0 ) System.out.println(num+" is an even number."); else System.out.println(num+" is an odd number."); } }

check No is prime or not:

public class Prime { public static void main(String[] args) { int num = 33, i = 2; boolean flag = false; while (i <= num / 2) { // condition for nonprime number if (num % i == 0) { flag = true; break; } ++i; } if (!flag) System.out.println(num + " is a prime number."); else System.out.println(num + " is not a prime number."); } }

reverse number:

class Rev{ public static void main(String args[]){ int a=234,rev=0,r; System.out.println("The original no is : " + a); while(a!=0) { r=a%10; rev=rev*10+r; a=a/10; } System.out.println("The rev no is : " + rev); } }

Numericpyramid:

class Numericpyramid { public static void main(String args[]) { //i for rows and j for columns //row denotes the number of rows you want to print int i, j, row=6; //outer loop for rows for(i=1; i<row; i++) { // inner loop for columns for(j=1; j<=i; j++ ) { //prints stars System.out.print(j); } //throws the cursor in a new line after printing each line System.out.println(); } } }

Series of addintion of square of numbers:

import java.util.Scanner; class Series{ public static void main(String[] args) { // create Scanner class object // to read input values Scanner scan = new Scanner(System.in); // declare variables int n; int sum = 0; // read N value System.out.print("Enter N value: "); n = scan.nextInt(); // calculate the sum of series for(int i=1; i<=n; i++) { sum = sum + i*i; } // display result System.out.println("Sum = " + sum); } }

Reverse of number:

import java.util.Scanner; class Revin { public static void main(String[] args) { int n = 1234, rev = 0; System.out.println("Enter an integer to reverse a number"); Scanner in = new Scanner(System.in); n=in.nextInt(); while(n !=0){ int digit = n%10; rev = rev * 10 + digit; n /= 10; } System.out.println(" Reverse Number: " + rev); } }

Armstrong Number:

class Main { public static void main(String[] args) { String str = "Radar", reverseStr = ""; int strLength = str.length(); for (int i = (strLength - 1); i >=0; --i) { reverseStr = reverseStr + str.charAt(i); } if (str.toLowerCase().equals(reverseStr.toLowerCase())) { System.out.println(str + " is a Palindrome String."); } else { System.out.println(str + " is not a Palindrome String."); } } }

palindromic number:

class Armstrong{ public static void main(String args[]){ int n1=153,r,req_no=0,temp; temp=n1; while(n1!=0) { r=n1%10; req_no=req_no+r*r*r; n1=n1/10; } if(req_no==temp) System.out.println(req_no+"Is Armsstrong"); else System.out.println(req_no+"Is not Armsstrong"); } }

palindromic number:

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palindromic number:

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palindromic number:

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palindromic number:

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palindromic number:

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palindromic number:

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palindromic number:

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palindromic number:

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palindromic number:

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palindromic number:

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Reverse number:

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